linux-kernel - Re: [PATCH v4 12/15] dmaengine: ti: New driver for K3 UDMA

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Date:   Tue, 12 Nov 2019 11:06:21 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Peter Ujfalusi <peter.ujfalusi@...com>
Cc:     robh+dt@...nel.org, nm@...com, ssantosh@...nel.org,
        dan.j.williams@...el.com, dmaengine@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, grygorii.strashko@...com,
        lokeshvutla@...com, t-kristo@...com, tony@...mide.com,
        j-keerthy@...com
Subject: Re: [PATCH v4 12/15] dmaengine: ti: New driver for K3 UDMA -
 split#4: dma_device callbacks 1

On 11-11-19, 12:29, Peter Ujfalusi wrote:
> On 11/11/2019 8.09, Vinod Koul wrote:
> > On 01-11-19, 10:41, Peter Ujfalusi wrote:

> >> +static enum dma_status udma_tx_status(struct dma_chan *chan,
> >> +				      dma_cookie_t cookie,
> >> +				      struct dma_tx_state *txstate)
> >> +{
> >> +	struct udma_chan *uc = to_udma_chan(chan);
> >> +	enum dma_status ret;
> >> +	unsigned long flags;
> >> +
> >> +	spin_lock_irqsave(&uc->vc.lock, flags);
> >> +
> >> +	ret = dma_cookie_status(chan, cookie, txstate);
> >> +
> >> +	if (!udma_is_chan_running(uc))
> >> +		ret = DMA_COMPLETE;
> > 
> > so a paused channel will result in dma complete status?
> 
> The channel is still enabled (running), the pause only sets a bit in the
> channel's real time control register.

Okay and which cases will channel not be running i.e., you return
DMA_COMPLETE above?

-- 
~Vinod